Time Zone Calculator
Compare the current time in any two cities and see the exact time difference. Live-updating and daylight-saving aware.
- Free, no sign-up
- Works worldwide
- Instant results
Times update live and account for current daylight saving where applicable.
How do I calculate the time difference between two cities?
The time difference is the gap between two cities' time zones, accounting for daylight saving time. For example, New York (Eastern Time) is 5 hours behind London, and Los Angeles is 8 hours behind London. The calculator below shows the live current time in both cities and the exact difference, updating automatically for daylight saving.
Methodology: Times reflect each location\u2019s IANA time zone, including daylight saving where applicable, from the standard time zone database. How we test & calculate.
Understand Time Zones Before You Travel
Crossing time zones is one of the more disorienting parts of travel. This time zone calculator shows you the current local time in any two places side by side, plus the exact difference between them — so you know whether it's a reasonable hour to call home, when your meeting actually falls, and how big a jet lag adjustment to expect.
Why Time Zones Exist
Time zones divide the world into regions that share a common standard time, roughly following lines of longitude. The system exists so that noon corresponds to the sun being highest in the sky wherever you are. The world has 24 primary time zones, but political boundaries and half-hour offsets make the real map far more complex.
Daylight Saving Time
Many countries shift their clocks forward in spring and back in autumn to make better use of daylight. Crucially, not all countries do this, and those that do change on different dates — which means the time difference between two cities can change several times a year. This calculator handles all of that automatically.
✈️ Planning a Trip Across Time Zones?
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Frequently Asked Questions
Select your two time zones and the calculator instantly shows the current local time in each, along with the exact hour difference. It updates live and automatically accounts for daylight saving time wherever it applies.